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Re: gem sound amplifier #exa 1005
Please disconnect your speaker from amp first-if fault goen connect your speaker one by one until you find the bad one-check the cable first and change it with new one and then change the speaker-if the fault still you will have a problem in your amp itself.
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I Think that something like a transistor is getting hot and then shutting down. Exploring inside might solve the problem of what's getting really hot. You could even get some Servisol Freeze Spray, and wait for it to go off then spray it on the suspected part. That will cool it down and it should start up again. If it does come on, that part will have to be replaced.
It is possible
that the amplifier had encountered a fault with a higher current drain which
had triggered it to a protection fault condition. The fault can be with your
output drivers. Please check for short on the outputs fitted for both the channels.
Use a meter after disconnecting to check for short in the drivers. Disconnect
the positive and negative voltages to the output and see if the protect
changes. Even a fault in the preamp stages that drives in high current into the
output can shut the Amplifier. Sometimes this can be a noise which can be a HUM
or HISS before the protect works. Faulty capacitors in these circuits also can
cause similar issues and needs close observation.You need to confirm and
replace the specific stages or outputs. If not there can be issues in the
mother board. Maybe the protect circuit by itself is shutting off due to a
faulty bias or there is a leak in any voltage/current sensing circuit. Also
disconnect the speakers and test, if the amplifier comes out of the protect
mode then check for short on the speakers.
Pleae check to see if you have over loaded the output with a wrong impedance . If so try to test the speakers and connect accordingly.
Next please check if the input source is bringing in poor signals with noise. try to cut off the hig and low freq to set the treble and bass in mid position. next use a ggood ground to take off any transcient voltage on the body due to any leakage in the power circuits. next you can disconnect and opne the panel and check for dry connections, loose connectors or poor filtering in signal processing or power circuits. If you notice any hum check this out. I hope this helps. Good day
First of all the EXA-3940 is rated at 350watts per channel in to 8 ohms. The 1400 watts is bridged into a 4 ohm load. Second, the speakers can handle 1000Wats peak with an average of 600 continuous (i'm guessing). That tells me that the amp is underpowered for the speakers. The sensitivity of the amp is such that the mixer is overdriving the input stage. That is what is causing the clipping. If you are looking for more volume, you are probably better off purchasing another amp and running them in bridge mode, 1 per speaker cab. Be careful though, not to overdrive the speaker cabinets either.
please confirm from your speakers cables in good condition and from your speakers.make maintenance to your amp by air blower-clean air filter-keep good ventilation around.after cleaning and good ventilation make test with any media while you are connecting one speaker only and then connect the other one.